I'm not sure where you are getting the impression two locked cases are required. Perhaps this statement?
"A firearm placed inside a hard-sided, locked suitcase must be encased in a hard-sided, locked container." (emphasis added)
That's saying you can't just place the gun in a hard sided, locked suitcase and claim that is the locked case. Since you have a dedicated, hard sided, locked case you're good to go.
--TheMiddleSeat
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